I love the way the plot unfolds in this book because it really shows Kaz's brilliance. And who doesn't love a good revenge story? While I don't think that this needs another book, I would love another book about the Crows. They are my favorite.
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You know, I still think this is Leigh Bardugo's best book. Granted, I haven't actually finished her adult fantasy duology, but still. There are lots of twists and turns, and man, the Crows. Yes, they're a bit morally gray but they are just so well developed. There's definitely a reason that most people like this duology best.

Also this one really connects to Shadow and Bone the best, and sets up what happens in the King of Scars duology. And this is why we need a Six of Crows spinoff show because everyone really loves them the best.
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Round two, just as good the second time! I think Bardugo's writing just gets so much better with this duology. I loved the twists and turns in this one, and the emotions! Ugh. I loved it. 
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Okay, Wylan and Jesper are probably my favorites in this. Also, I think I liked this one better than Six of Crows. It was so twisty and emotional and fantastic. I definitely understand the hype better, now! It was a whirlwind of a read.